12405827531 has 4 divisors (see below), whose sum is σ = 12694335192. Its totient is φ = 12117319872.

The previous prime is 12405827509. The next prime is 12405827543. The reversal of 12405827531 is 13572850421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12405827531 - 2²² = 12401633227 is a prime.

It is a super-2 number, since 2×12405827531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12405827591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144253766 + ... + 144253851.

It is an arithmetic number, because the mean of its divisors is an integer number (3173583798).

Almost surely, 2^12405827531 is an apocalyptic number.

12405827531 is a deficient number, since it is larger than the sum of its proper divisors (288507661).

12405827531 is an equidigital number, since it uses as much as digits as its factorization.

12405827531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288507660.

The product of its (nonzero) digits is 67200, while the sum is 38.

The spelling of 12405827531 in words is "twelve billion, four hundred five million, eight hundred twenty-seven thousand, five hundred thirty-one".